Adjustable drawing-table.



A; HOFFMAN.

ADJUSTABLE DRAWING TABLE.

APPLICATION FILED we. '1. 1009.

956 696 Patented Apr. 26, 1910.

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Mara/1% aNDniw u GRAHAM co Puom-uwomuwcns wnsmramon D C ADOLPH HOFFMAN,OF COLUMBUS, OHIO.

ADJUSTABLE DRAWING-TABLE.

Specification of Letters Patent.

Application filed August 7, 1909.

Patented Apr. 26, 1910. Serial No. 511,733.

To all whom it may concern.

Be it known that I, ADOLPH HOFFMAN, a citizen of the United States,residing at C0- lumbus, in the county of Franklin and State of Ohio,have invented certain new and useful Improvements in Adjustable Drawing-Tables, of which the following is a specification.

My invention relates to the improvement of adjustable drawing tables andthe objects of my invention are to provide in conjunction with a tableor other supporting body, improved means for supporting a drawing boardat a desired angle; to so construct my improved drawing board supportingmeans as to admit of the board being rotated independently of thesupporting table top and to produce other improvements the details ofwhich will be more fully pointed out hereinafter. These objects Iaccomplish in the manner illustrated in the accompanying drawing, inwhich:

Figure 1 is a front elevation of a portion of a table top showing adrawing board supported therefrom by my improved means, said drawingboard being shown in the horizontal position, and, Fig. 2 is a sideelevation of the same showin the drawing board supported in an inclinedposition.

Similar numerals refer to similar parts throughout the several views.

1 represents the horizontal top member of a table of any suitablecharacter and 2 represents separated table clamping brackets, each ofwhich preferably comprises a vertical member 2 from which upper andlower arms 2 and 2 project at right angles. The lower clamping arm 2 hasa threaded engagement with the usual clamping screw 3 whlch is adaptedto be turned into clamping engagement with the underside of the marginalportion of the table 1, the upper clamping jaw 2 being in engagementwith the upper side of said table. With each of the members 2 of each ofthe clamps, is formed a bearing projection 4 and within these bearingprojections are rigidly secured the ends of a horizontal rod 5. On therod 5 is rotatably and slidably mounted a sleeve 6, with the centralenlargement of which is formed an arm 7 which terminates in a reducedpin extension 7. The sleeve 6 is adapted to be locked in the desiredposition upon the rod 5 by means of a suitable form of set screw 8 whichpasses through a threaded opening in said sleeve.

9 represents a drawing board which has ailixed to its underside onopposite sides of its center, a pair of bracket plates 10, the latterhaving depending therefrom, suitable brackets or keepers 10.

11 represents a coupling and bearing memher, which is in the nature ofan upright tubular body 11 from opposite sides of which project at rightangles therewith, socket arms 11". Secured in each of these socket armsis the inner end of a short horizontal rod section 12, the outer end ofwhich is connected with the depending bracket 10 of the drawing board.The upright member 11 of the bearing and coupling device, receivesloosely the pin extension 7 of the arm 7 heretofore described.

13 represents a set screw of suitable form, which passes through athreaded o ening in the bearing member 11 and is ac apted tofrictionally engage the pin 7, thereby providing means of locking saidmember ll against rotation on said pin.

From the construction described, it will be understood that by looseningthe set screw 8, the drawing board may through the turning of the sleeve6 on the rod 5, be turned or moved to a desired inclination withrelation to the table (see Fig. 2). It is also obvious that by looseningthe set screw 12, the drawing board 9 may be rotated or its bearingmember 11 whirled or rotated upon the pin 7 thus providing means forturning the drawing sheet to the position most desirable for the use ofthe draftsman. It is also evident that when the set screw 8 is loosened,the sleeve 6 may be moved horizontally upon the rod 5, thus carrying ormoving the drawing table when desired to a new position at the right orleft, in which position the board may be held by tightening said setscrew 8.

Although I have heretofore described my drawing board support as carriedby a table top, it will be obvious that the same may be applied to theledge or projecting member of any article of furniture or otherframework which may be embraced by the clamping members and owing to thefact that the drawing board and the supporting members connectedtherewith, may be readily lifted out of engagement with the pin 7 andthat the clamping members may be readily disengaged from the supportingtable top or other support, it is evident that a separation of the partsdescribed may be readily attained.

From the foregoing description, it will be seen that simple andefficient means are herein provided for accomplishing the objects of theinvention, but while the elements shown and described are well adaptedto serve the purposes for which they are intended, it is to beunderstood that the invention is not limited to the precise constructionset forth, but includes within its purview such changes as may be madewithin the scope of the appended claim.

WVhat I claim, is:

In a support for drawing boards, the combination with a bracket bodycomprising clamps, a rod extending between said clamps, a rotatablesleeve on said rod, said sleeve having a pin projecting therefrom, and aset screw for retaining said sleeve in engagement with said rod, of adrawing board, brackets depending therefrom, a tubular bearing memberrotatably mounted on said pin, rods connecting said bearing member andbrackets, and a set screw for limiting the rotary movement of saidbearing member on said pin.

In testimony whereof I aifix my signature in presence of two Witnesses.

ADOLPH HOFFMAN. Witnesses: v i

A. L. PHELPS,

L. CARL S'roUcH'roN.

